There's nothing biblical about preserving this world..though most do what they can to tend it while here... appears you've taken the bait for believing otherwise.
I do find many more people who understand these times and are still very much going about their life as normalthan that which you've mentioned..... They have concerns for their familys future and are working hard to prepare them for it as most loving families do. An yet they are very much aware of the times we live and that Christ can come at any time. It's an expectation we have which Christ himself encouraged us to "watch".
It's odd you would say that people aren't interested if "preserving the republic" the primary itself evidences otherwise as do many who post throughout FR....this nations people have always attempted to do their part...even in light of the times and seasons.
Jesus said to render unto God what is God's and unto Caesar what is Caesar's. You're a free citizen of a self-governing constitutional republic. That comes with responsibilities.
Politically, I'm an "original intent" Constitutionalist. I don't look for enumerated powers in the Bible. Saying that people "aren't interested in preseving the repulic" is mild compared to the criticism I get for having that view.